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3 Phase in your shop??

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Forum topic by scribble posted 06-01-2018 07:51 PM 938 views 0 times favorited 43 replies Add to Favorites Watch
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scribble

196 posts in 2319 days


06-01-2018 07:51 PM

Topic tags/keywords: question

I have a opportunity to add 3 phase power to my garage shop. The power company says it will cost $150.00 for install plus $35.00 a month for meter usage fee. The KW usage is supposed to be the same charge as our normal single phase.
I am seriously considering it as I see smoking deals on 3 phase equipment all the time from schools and companies selling there goods.

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”


43 replies so far

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TheFridge

10105 posts in 1604 days


#1 posted 06-01-2018 08:03 PM

You’ll have to include the cost of upgrading your service. 1500$ on the cheap side.

If you see a deal don’t let the fact that it’s 3ph ever dissuade you.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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scribble

196 posts in 2319 days


#2 posted 06-01-2018 08:06 PM

When you say upgrade the service are you referring to going from 100 amp to 200 amp service in single phase?

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

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TheFridge

10105 posts in 1604 days


#3 posted 06-01-2018 08:08 PM

no. Mainly upgrading at minimum to a 3 ph panel with a main in it.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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scribble

196 posts in 2319 days


#4 posted 06-01-2018 08:10 PM

Surprised the person at the electric company said nothing about that. He said it would be no charge for them to drop it to the mast I have on the garage from the electrician.
It will be a completely seperate system for the garage as my single into the garage is from the detached house.

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

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Loren

10477 posts in 3766 days


#5 posted 06-01-2018 08:26 PM

I’d just crunch the numbers on putting together
a rpc. Once you get above a 10hp converter
you’re also dealing with seriously heavy machines
as well and that involves moving them and
other fun activities.

There are plenty of “lighter” duty 3 phase
machines out there that can run with a 10hp
or smaller rpc. I think I’ve only got about
$400 into mine.

If you’re looking at 7.5hp shapers and wide
belt sanders then you’d be looking at a bigger
rpc and maybe at some point the $35 monthly
charge makes more sense.

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scribble

196 posts in 2319 days


#6 posted 06-01-2018 08:27 PM

I actually was only thinking about it for a table saw as that is really the only major downfall I see in my shop. I can find delta 5hp unisaws with 52” fences for anywhere from 250-500

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

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Loren

10477 posts in 3766 days


#7 posted 06-01-2018 08:30 PM

Well, you’d be spending $420 per year for
the pleasure of being able to switch it on.

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scribble

196 posts in 2319 days


#8 posted 06-01-2018 08:45 PM

Suggestions on setting up an RPC? I have heard that you loose HP with running convertors.

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

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Loren

10477 posts in 3766 days


#9 posted 06-01-2018 08:56 PM

Only with a static converter. Those cut the hp
by 1/3. A rotary converter doesn’t have that
issue. You can buy a Phase-craft or other panel
and wire it up to a 3-phase idler motor, which
can be found used for cheap. It’s pretty simple
to do and a lot cheaper than buying a rpc.

View AZWoody's profile

AZWoody

1396 posts in 1342 days


#10 posted 06-01-2018 09:02 PM

If you think you might go the vintage machinery route, I would do it in a heartbeat. If it’s just for one machine, that’s a tough call.

It would give you a lot of flexibility on used machinery though and you’ll be able to get some killer deals out there.

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scribble

196 posts in 2319 days


#11 posted 06-01-2018 09:13 PM

im just in a small 1 car garage but getting tired of my small 3/4-1HP saw and would really like to upgrade to something with some decent power and considering i can get 3-5hp cabinet saws for under $500 i thought that may be the best route.

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

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MrUnix

6888 posts in 2317 days


#12 posted 06-01-2018 09:16 PM

I actually was only thinking about it for a table saw as that is really the only major downfall I see in my shop. I can find delta 5hp unisaws with 52” fences for anywhere from 250-500
- scribble

Then just add $200 for a VFD and reap the many benefits you will get going that route over straight 3-phase. There is no reason to have a recurring charge just to run one machine.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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Fresch

302 posts in 2039 days


#13 posted 06-01-2018 09:22 PM



Surprised the person at the electric company said nothing about that. He said it would be no charge for them to drop it to the mast I have on the garage from the electrician.
It will be a completely seperate system for the garage as my single into the garage is from the detached house.

- scribble

That was because it isn’t his responsibility, they only go to the service point; that point is what you and your electrical guy come up with. Mast, demand meter can, wire, 3phase panel (buy it full of breakers, it’s cheaper that way), grounding, inspection/permits, circuits out of the panel.

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scribble

196 posts in 2319 days


#14 posted 06-01-2018 09:43 PM

The $150.00 was the electricians portion to install panel, and mast. I will do the wiring in the garage.

-- If you can't read it Scribble wrote it!! “Experience is merely the name men gave to their mistakes.”

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ibewjon

43 posts in 2911 days


#15 posted 06-01-2018 10:45 PM

$150 won’t buy anything electrical these days. Maybe the upgrade cost for an empty panel. Does the power company give you the meter socket free? Being an IBEW electrician for over 40 years, the prices do not seem possible. Remember if it seems too good to be true, it probably is. For a big shop, yes. For a one car garage, forget it. Remember, most places the rate for a service without a house is commercial, usually much higher. 3 phase (4 wire) cord, plugs and receptacles, breakers, pricey. Conduit a must, as the white wire in Romex can NOT be used for a hot wire. Marking is not approved. Plenty of good single phase table saw out there.

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